In what situation might a secondary safety device be necessary?

A secondary safety device is particularly necessary when lifting loads near power lines or over crowded areas due to the increased risk involved. In these scenarios, the proximity to potential hazards—such as electrical hazards from power lines or the risk of accidental injury to people in densely populated spaces—demands an added layer of safety. These devices can serve as a fail-safe mechanism to prevent accidents or injuries that could arise from a primary system failure, human error, or unexpected circumstances.

In contrast, lifting loads in clear areas, lifting lighter loads within specified limits, and lifting loads in favorable weather conditions do not generally present the same level of risk that would necessitate secondary safety devices. Clear areas typically allow for greater maneuverability and reduced hazards, while lighter loads and favorable weather conditions usually enable safer operations, further reducing the likelihood of incidents that secondary devices are designed to mitigate.